Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c91b505d5ba08b…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 06:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c617e98df1bb70add47f9b3b54853a5 SHA-1: a21c5f16efeb2a6c91140f574a5c82a0b6ecf2d1 SHA-256: 90c91b505d5ba08b7de080cbbd0ace5801edeb070814f5a321cfe35b6df9430d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on potentially compromised or disposable domains. This pattern is commonly used for phishing or SEO poisoning attacks to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=freak+the+mighty+book+pdf
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/12333087743.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece2148e03---dugagilejuwixuzalodutofef.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1153cbff7f9600d4a1c08206e7385667/varebogeju.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/83221658391.pdf
    • http://abwrva.com/uploads/files/vabodupe.pdf
    • https://samavetpharm.com/userfiles/files/muminagubofuk.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091394758b34---39960887830.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a458e105e---widaget.pdf
    • https://sy-tech.eu/file/favekoguragezudezex.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/c9g3asue039069r6edeeoi6n4t/28791265435.pdf
    • http://kaowei.tw/image/files/20210617_195007.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2fe1232a---81540280161.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdce55a483---13184357555.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baebbb9f85---sopuju.pdf
    • http://ahcxdq.com/uploads/file/290217172185.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b55c568ff---lolupawok.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ab09a790bb25c7dd611947ebea686020/7727475905.pdf
    • https://abugfreemind.com/userfiles/file/93257816580.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08ff68d152---2332217826.pdf
    • https://angelsstaff.com/uploads/file/32640275683.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd9.bin
35f4c77318445470c09b9b72e30f407a9ae677e295cb219872b316b23e998bf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 17336 bytes
font_01_sfnt_off00011a96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 16792 bytes
font_02_sfnt_off000132ad.bin
900d84b2cabd5561024bf0cd92c5cab7a62173ae5942c12db6a7f09255fafb3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 10952 bytes